Joan Díaz-Calafat
@jdiazcalafat.bsky.social
Ecology and Entomology | Wild bees | Pollinators | Microclimate | Boreal forests | Invasive species | Hymenoptera taxonomy 🌲🌻🐝🐜🏳️🌈
🌳 For F. vesca, arthropod richness was higher in open, broadleaf-dominated plots—likely due to more light boosting pollinator activity. Forest density had a negative effect.
September 6, 2025 at 3:57 PM
🌳 For F. vesca, arthropod richness was higher in open, broadleaf-dominated plots—likely due to more light boosting pollinator activity. Forest density had a negative effect.
🌸 We translocated Fragaria vesca (wild strawberry) and Trifolium pratense (red clover) into 40 forest plots varying in density and tree composition. Each plant came paired: one accessible to pollinators, one covered as a control.
September 6, 2025 at 3:57 PM
🌸 We translocated Fragaria vesca (wild strawberry) and Trifolium pratense (red clover) into 40 forest plots varying in density and tree composition. Each plant came paired: one accessible to pollinators, one covered as a control.
🌿 New paper alert! 📢
We used flower-based eDNA metabarcoding to uncover how forest structure and microclimate shape the diversity of flower-visiting arthropods in a Swedish boreal forest. #pollinators #eDNA 🧬🌼
We used flower-based eDNA metabarcoding to uncover how forest structure and microclimate shape the diversity of flower-visiting arthropods in a Swedish boreal forest. #pollinators #eDNA 🧬🌼
September 6, 2025 at 3:57 PM
🌿 New paper alert! 📢
We used flower-based eDNA metabarcoding to uncover how forest structure and microclimate shape the diversity of flower-visiting arthropods in a Swedish boreal forest. #pollinators #eDNA 🧬🌼
We used flower-based eDNA metabarcoding to uncover how forest structure and microclimate shape the diversity of flower-visiting arthropods in a Swedish boreal forest. #pollinators #eDNA 🧬🌼
Some species, like Bombus hypnorum, are especially prone to weekend bias, likely because they nest in vertical structures and often enter buildings. Their urban, visible habits make them easier to spot.
Bias isn’t just temporal: it’s tied to species traits too. 🐝🏙️
Bias isn’t just temporal: it’s tied to species traits too. 🐝🏙️
July 8, 2025 at 7:41 PM
Some species, like Bombus hypnorum, are especially prone to weekend bias, likely because they nest in vertical structures and often enter buildings. Their urban, visible habits make them easier to spot.
Bias isn’t just temporal: it’s tied to species traits too. 🐝🏙️
Bias isn’t just temporal: it’s tied to species traits too. 🐝🏙️
When we modeled the emergence date of Bombus hortorum without adjusting for weekend bias, we found a significant advance over time.
After adjusting for the day of the week?
🚫 The trend disappeared.
📉 Bias can send us down the wrong path.
After adjusting for the day of the week?
🚫 The trend disappeared.
📉 Bias can send us down the wrong path.
July 8, 2025 at 7:41 PM
When we modeled the emergence date of Bombus hortorum without adjusting for weekend bias, we found a significant advance over time.
After adjusting for the day of the week?
🚫 The trend disappeared.
📉 Bias can send us down the wrong path.
After adjusting for the day of the week?
🚫 The trend disappeared.
📉 Bias can send us down the wrong path.
We compared 2M+ citizen science records and 340k museum specimens.
🎯 Citizen science peaked on weekends.
🏛️ Museum data? The opposite—more records on weekdays.
Two biases, two directions. Both matter for how we interpret trends.
🎯 Citizen science peaked on weekends.
🏛️ Museum data? The opposite—more records on weekdays.
Two biases, two directions. Both matter for how we interpret trends.
July 8, 2025 at 7:41 PM
We compared 2M+ citizen science records and 340k museum specimens.
🎯 Citizen science peaked on weekends.
🏛️ Museum data? The opposite—more records on weekdays.
Two biases, two directions. Both matter for how we interpret trends.
🎯 Citizen science peaked on weekends.
🏛️ Museum data? The opposite—more records on weekdays.
Two biases, two directions. Both matter for how we interpret trends.
🚨 New paper alert!
Why do queen bumblebees seem to "wake up" on weekends?
It turns out, they don’t.
But we see them more on weekends, and that’s a problem for climate research. Here’s why. 👇🐝
📄 Díaz-Calafat & Luna-Santamaría (2025)
doi.org/10.1007/s135...
Why do queen bumblebees seem to "wake up" on weekends?
It turns out, they don’t.
But we see them more on weekends, and that’s a problem for climate research. Here’s why. 👇🐝
📄 Díaz-Calafat & Luna-Santamaría (2025)
doi.org/10.1007/s135...
July 8, 2025 at 7:41 PM
🚨 New paper alert!
Why do queen bumblebees seem to "wake up" on weekends?
It turns out, they don’t.
But we see them more on weekends, and that’s a problem for climate research. Here’s why. 👇🐝
📄 Díaz-Calafat & Luna-Santamaría (2025)
doi.org/10.1007/s135...
Why do queen bumblebees seem to "wake up" on weekends?
It turns out, they don’t.
But we see them more on weekends, and that’s a problem for climate research. Here’s why. 👇🐝
📄 Díaz-Calafat & Luna-Santamaría (2025)
doi.org/10.1007/s135...
Presenting the flower eDNA work I did during my PhD at the #UIBiodiversityDay2025
May 22, 2025 at 9:55 AM
Presenting the flower eDNA work I did during my PhD at the #UIBiodiversityDay2025
All ready for the #UIBiodiversityDay2025 ! @uib.cat
May 22, 2025 at 8:13 AM
All ready for the #UIBiodiversityDay2025 ! @uib.cat
New paper out! 📢
The effects of climate change on boreal plant-pollinator interactions are largely neglected by science
🐝 🪲 🪰 🦋 🌼 🌲 🌡️
Read more here: doi.org/10.1016/j.ba...
The effects of climate change on boreal plant-pollinator interactions are largely neglected by science
🐝 🪲 🪰 🦋 🌼 🌲 🌡️
Read more here: doi.org/10.1016/j.ba...
April 3, 2025 at 3:32 PM
New paper out! 📢
The effects of climate change on boreal plant-pollinator interactions are largely neglected by science
🐝 🪲 🪰 🦋 🌼 🌲 🌡️
Read more here: doi.org/10.1016/j.ba...
The effects of climate change on boreal plant-pollinator interactions are largely neglected by science
🐝 🪲 🪰 🦋 🌼 🌲 🌡️
Read more here: doi.org/10.1016/j.ba...
After four years, I am finally done with my PhD thesis and it is now publicly available: res.slu.se/id/publ/130460 📕🤓🐝
In Sweden, once we reach this stage, we nail one copy of the thesis to the wall, where it'll stay for remembrance. Now three weeks to the public defence! 📆
In Sweden, once we reach this stage, we nail one copy of the thesis to the wall, where it'll stay for remembrance. Now three weeks to the public defence! 📆
September 8, 2024 at 7:14 AM
After four years, I am finally done with my PhD thesis and it is now publicly available: res.slu.se/id/publ/130460 📕🤓🐝
In Sweden, once we reach this stage, we nail one copy of the thesis to the wall, where it'll stay for remembrance. Now three weeks to the public defence! 📆
In Sweden, once we reach this stage, we nail one copy of the thesis to the wall, where it'll stay for remembrance. Now three weeks to the public defence! 📆
📢New paper out! We explore the power of #CitizenScience in biodiversity research, comparing insect data from participatory platforms & academic projects in the Iberian Peninsula. Discover insights on biases and the benefits of integrating both data sources 🌍🦋📊
🔗 journals.plos.org/plosone/arti...
🔗 journals.plos.org/plosone/arti...
July 18, 2024 at 7:39 PM
📢New paper out! We explore the power of #CitizenScience in biodiversity research, comparing insect data from participatory platforms & academic projects in the Iberian Peninsula. Discover insights on biases and the benefits of integrating both data sources 🌍🦋📊
🔗 journals.plos.org/plosone/arti...
🔗 journals.plos.org/plosone/arti...
Regarding their potential as pollinators, we found that *at least* 42.7% of the individuals in pictures carried pollen attached to their podies. This is likely an underestimation, as most pictures were taken dorsally, and pollen attached to the wasps' ventral side was not visible 📸Alexander Fateryga
June 6, 2024 at 11:55 AM
Regarding their potential as pollinators, we found that *at least* 42.7% of the individuals in pictures carried pollen attached to their podies. This is likely an underestimation, as most pictures were taken dorsally, and pollen attached to the wasps' ventral side was not visible 📸Alexander Fateryga
Apiaceae display open floral systems (i.e., nectar and pollen fully exposed, with no floral restrictions) making them easily accessible to a large diversity of insect visitors, especially those with short mouthparts which are unable to access narrow tubular corollas. 📸 Faluke
June 6, 2024 at 11:52 AM
Apiaceae display open floral systems (i.e., nectar and pollen fully exposed, with no floral restrictions) making them easily accessible to a large diversity of insect visitors, especially those with short mouthparts which are unable to access narrow tubular corollas. 📸 Faluke
Even though the most-visited plant families remained, there were some differences. The top 3 for males was 🥇Apiaceae, 🥈Asteraceae and 🥉Euphorbiaceae, while females went for 🥇Apiaceae, 🥈Fabaceae and 🥉Asteraceae.
June 6, 2024 at 11:52 AM
Even though the most-visited plant families remained, there were some differences. The top 3 for males was 🥇Apiaceae, 🥈Asteraceae and 🥉Euphorbiaceae, while females went for 🥇Apiaceae, 🥈Fabaceae and 🥉Asteraceae.
However, males and females seemed to visit different flower communities 🤯 The diet of male and female Mutillidae differed by 43.48% (red dot), which was significantly more than what was expected by random chance (grey area, 9999 permutations).
June 6, 2024 at 11:51 AM
However, males and females seemed to visit different flower communities 🤯 The diet of male and female Mutillidae differed by 43.48% (red dot), which was significantly more than what was expected by random chance (grey area, 9999 permutations).
We recorded all velvet ant and plant species from these pictures, and built bipartite networks to visualize flower visitation patterns. We got 40 velvet ant genera (~125 spp) across 37 plant families (~200 spp). 📸 doi.org/10.1111/jen....
June 6, 2024 at 11:50 AM
We recorded all velvet ant and plant species from these pictures, and built bipartite networks to visualize flower visitation patterns. We got 40 velvet ant genera (~125 spp) across 37 plant families (~200 spp). 📸 doi.org/10.1111/jen....
Together with Daniel Parejo Pulido and Jairo Robla, we went through 63,433 photographic records from citizen science platforms worldwide, as well as other unpublished records, to shed some light on this. 📷 doi.org/10.1111/jen....
June 6, 2024 at 11:49 AM
Together with Daniel Parejo Pulido and Jairo Robla, we went through 63,433 photographic records from citizen science platforms worldwide, as well as other unpublished records, to shed some light on this. 📷 doi.org/10.1111/jen....
Then, females parasite a wide range of insects, laying eggs on their larvae, so that the offspring can feed on them as well as on the nest provisions. 📷 Su et al. t.co/5zEEaUFDQ5
June 6, 2024 at 11:48 AM
Then, females parasite a wide range of insects, laying eggs on their larvae, so that the offspring can feed on them as well as on the nest provisions. 📷 Su et al. t.co/5zEEaUFDQ5
In some cases, while mating, winged males will carry the wingless females. This is called phoretic mating. 📷 Jason D. Roberts in t.co/sx6ai0nQJ5
June 6, 2024 at 11:47 AM
In some cases, while mating, winged males will carry the wingless females. This is called phoretic mating. 📷 Jason D. Roberts in t.co/sx6ai0nQJ5
Velvet ants (Mutillidae and Myrmosidae) are pretty cool creatures! Despite their name, they are actually wasps, and not ants. (Most) males are winged, and females do not have wings.
June 6, 2024 at 11:46 AM
Velvet ants (Mutillidae and Myrmosidae) are pretty cool creatures! Despite their name, they are actually wasps, and not ants. (Most) males are winged, and females do not have wings.